Monday, September 21, 2015

MAGNAVOX 32MF338B SERVICE MODE AND POWER SUPPLY CIRCUIT

MAGNAVOX 32MF338


SERVICE MODE AND POWER SUPPLY CIRCUIT 


How to set up the service mode
Service mode:
1. Use the service remote control unit.
2. Turn the power on.
3. Press the service button on the service remote control unit
.
How to make the Service remote control unit:Cut “A” portion of the attached remote control unit as shown in Fig.

Purity Check Mode
This mode cycles through full-screen displays of red, green, blue, and white to check for non-active pixels.
1. Enter the Service mode.
2. Each time pressing [7] button on the service remote control unit, the display changes.
1. Operate the unit for more than 20 minutes.
2. Set the color analyzer and bring the optical receptor to the center on the LCD-Panel surface after zero point calibration as shown above.
Note: The optical receptor must be set perpendicularly to the LCD Panel surface.
3. Enter the Service mode.
4. Press [2] button on the service remote control unit.
5. Press [CH. + / - ] buttons on the service remote control unit so that the color analyzer value becomes minimum.
White Balance Adjustment
Purpose:
To mix red, green and blue beams correctly for pure white.
Symptom of Misadjustment: White becomes bluish or reddish.
1. Operate the unit for more than 20 minutes.
2. Input the White Raster(70%=70IRE, 25%=25IRE).
3. Set the color analyzer to the CHROMA mode and bring the optical receptor to the center on the LCD-Panel surface after zero point calibration as
shown above.
Note: The optical receptor must be set
perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press [VOL. - ] button on the service remote control unit and select “C/D” mode.
5. [CUTOFF]
Press [3] button to select “COB” for Blue Cutoff adjustment. Press [1] button to select “COR” for Red Cutoff adjustment.
[DRIVE]
Press [6] button to select “DB” for Blue Drive adjustment. Press [4] button to select “DR” for Red Drive adjustment.
6. In each color mode, press [CH. + / - ] buttons to adjust the values of color.
7. Adjust Cutoff and Drive so that the color temperature becomes 12000°K (x= 0.272 / y= 0.278 ±0.005).
Firmware Renewal Mode
Equipment Required
a. Serial 4pin Cable
b. RS232C Cable
c. "iDev .exe" file
d. "*** .ecc" file
1. Remove the Cover for Serial Connector on the rear cabinet.
2. Connect the Serial 4pin Cable to the Serial Connector, the Serial 4pin Cable to the RS232C Cable, and the RS232C Cable to the PC.
3. Plug in the AC Cord and turn LCD TV power on.
4. Execute the "iDev .exe" file.
5. Click "setup" menu.
5-1 Set Serial Port. Comform it to the PC’s Serial Port. (generally "COM1")
5-2 Set Baud Rate to "115200".
5-3 Select "*** .ecc" file for Image Path.
5-4 Click "OK" and turn the LCD TV power off.
6. Click "down" and when "waiting for ping..." is displayed, turn the LCD TV power on.
7. Wait for updating. When "Finished, Please reset the HDTV" is displayed, unplug the AC Cord.
8. Updating is complete
How to initialize the LCD TV
1. Turn the power on.
2. To enter the service mode, press the service button on the service remote control unit.
- To cancel the service mode, press [POWER] button on the remote control unit.
3. Press [INFO] button on the service remote control unit to initialize the LCD TV.
4. "INITIALIZED" will appear in the upper right of the screen. "INITIALIZED" color will change to green from red when initializing is complete.
ABBREVIATIONS USED IN MAGNAVOX LCD TV
CSM:Customer Service Mode
ATSC: Advanced Television Systems Committee, the digital TV standard in the USA
DVD:Digital Versatile Disc
EEPROM:Electrically Erasable and Programmable Read Only Memory
3DNR: Temporal (3D) Noise Reduction
AGC: Automatic Gain Control: algorithm that controls the video input of the feature box
FM: Field Memory or Frequency Modulation
AM: Amplitude Modulation
AP: Asia Pacific
ASF: Auto Screen Fit: algorithm that adapts aspect ratio to remove horizontal black bars without discarding video information
ATV: See Auto TV .Auto TV A hardware and software control system that measures picture content, and adapts image parameters in a dynamic way
AV: External Audio Video
AVIP: Audio Video Input Processor
B/G: Monochrome TV system. Sound carrier distance is 5.5 MHz ComPair Computer aided rePair
CP: Connected Planet / Copy Protection
CSS: Content Scrambling System; An encryption method for MPEG-2 video on DVDs. The algorithm and keys required to decode the disc are stored on the DVD-player
CVBS: Composite Video Blanking and Synchronization
DFU: Directions For Use: owner's manual
DNR: Digital Noise Reduction: noise reduction feature of the set
DSP: Digital Signal Processing
DST: Dealer Service Tool: special remote control designed for service technicians
DTCP: Digital Transmission Content Protection; A protocol for protecting digital audio/video content that is traversing a high speed serial bus, such as IEEE-1394
DVI(-d): Digital Visual Interface (d= digital only)
EAS: Emergency Alert Signalling; A cable TV standard (SCTE18) to signal emergency information to digital terminal devices
E-DDC: Enhanced Display Data Channel (VESA standard for communication channel and display). Using E-DDC, the video source can read the EDID information form the display.
EDID: Extended Display Identification Data (VESA standard)
EMI: Electro Magnetic Interference
EMM: Entitlement Management Message
EPLD: Erasable Programmable Logic Device
EU: Europe
FBL: Fast BLanking: DC signal accompanying RGB signals
FDS: Full Dual Screen (same as FDW)
FDW: Full Dual Window (same as FDS)
FLASH: FLASH memory
FTV: Flat TeleVision
H H:sync to the module
HD: High Definition
HDD: Hard Disk Drive
NTSC: National Television Standard Committee. Color system mainly used in North America and Japan. Color carrier NTSC M/N= 3.579545 MHz, NTSC: 4.43= 4.433619 MHz (this is a
VCR: norm, it is not transmitted off-air)
NVM: Non-Volatile Memory: IC containing TV related data such as alignments
OSD: On Screen Display
PLL: Phase Locked Loop. Used for e.g.
LVDS: Low Voltage Differential Signalling
PAL: Phase Alternating Line. Color system mainly used in West Europe (color carrier= 4.433619 MHz) and South America (color carrier PAL M= 3.575612 MHz and PAL N= 3.582056MHz)
PCB: Printed Circuit Board (same as PWB)
PCM: Pulse Code Modulation
PWB: Printed Wiring Board (same as "PCB")
PWM: Pulse Width Modulation
QAM: Quadrature Amplitude Modulation;modulation method
RAM: Random Access Memory
RGB: Red, Green, and Blue. The primary color signals for TV. By mixing levels of R, G, and B, all colors (Y/C) are reproduced.
RC: Remote Control RC5 / RC6 Signal protocol from the remote control receiver
RESET: RESET signal
ROM: Read Only Memory
SAM: Service Alignment Mode
SCART: Syndicat des Constructeurs d'Appareils Radiorecepteurs et Televisieurs
SCL: Serial Clock I2C
SCL-F: CLock Signal on Fast I2C bus
SD: Standard Definition
SDA: Serial Data I2C
SDA-F: DAta Signal on Fast I2C bus
SDI: Serial Digital Interface, see “ITU-656”
SDRAM: Synchronous DRAM
SECAM: SEequence Couleur Avec Memoire. Color system mainly used in France and East Europe. Color carriers= 4.406250 MHz and 4.250000 MHz
SIF: Sound Intermediate Frequency
SMPS: Switched Mode Power Supply
SOG: Sync On Green
SOPS: Self Oscillating Power Supply
I2C: Integrated IC bus
I2D: Integrated IC Data bus
I2S: Integrated IC Sound bus
IB: In Band channel
IF: Intermediate Frequency
Interlaced: Scan mode where two fields are used to form one frame. Each field contains half the number of the total amount of lines. The fields are written in "pairs", causing line flicker.
IR: Infra Red
IRQ: Interrupt Request
LATAM: Latin America
LCD: Liquid Crystal Display
LED: Light Emitting Diode
LPL: LG.Philips LCD (supplier)
MUTE: MUTE Line
TFT: Thin Film Transistor
SRAM: Static RAM
STBY: STandBY
SOG: Sync On Green
SVGA: 800x600 (4:3)
SVHS: Super Video Home System
SW: Software
SWAN: Spatial temporal Weighted Averaging Noise reduction
SXGA: 1280x1024
TMDS: Transmission Minimized Differential Signalling
UXGA: 1600x1200 (4:3)
V: V-sync to the module
VCR: Video Cassette Recorder
VESA: Video Electronics Standards Association
VGA: 640x480 (4:3)
VL: Variable Level out: processed audio output toward external amplifier
VSB: Vestigial Side Band; modulation method
WYSIWYR: What You See Is What You Record: record selection that follows main picture and sound
WXGA: 1280x768 (15:9)
XGA: 1024x768 (4:3)
Y: Luminance signal
YPbPr: Component video. Luminance and scaled color difference signals (B-Y and R-Y)

POWER SUPPLY CIRCUIT

POWER BOARD 
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